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Viruses and autoimmune liver disease

M P Manns1

  • 1Department of Gastroenterology and Hepatology, Medizinische Hochschule Hannover, FRG.

Intervirology
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

Autoimmune hepatitis type 2, particularly when associated with Hepatitis C Virus (HCV) infection, presents unique characteristics. Research explores the viral and genetic links in this autoimmune liver disease.

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Area of Science:

  • Hepatology
  • Immunology
  • Virology

Background:

  • Autoimmune hepatitis (AIH) is an autoimmune liver disease characterized by hypergammaglobulinemia, autoantibodies, and response to immunosuppression.
  • AIH has distinct subgroups, with type 2 defined by liver/kidney microsomal autoantibodies (LKM-1) targeting cytochrome P-450 II D6.
  • The etiology of AIH remains largely unknown, though viral associations are noted, particularly in type 2.

Purpose of the Study:

  • To investigate the association between autoimmune hepatitis type 2 and viral infections, specifically Hepatitis C Virus (HCV) and Herpes Simplex Virus (HSV-1).
  • To characterize differences between HCV RNA-positive and HCV-negative patients with autoimmune hepatitis type 2.
  • To explore potential genetic factors, including human leukocyte antigen (HLA) alleles, associated with HCV-negative autoimmune hepatitis type 2.

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Main Methods:

  • Analysis of patient cohorts with autoimmune hepatitis type 2, differentiating between HCV RNA-positive and HCV-negative individuals.
  • Hepatitis C Virus (HCV) sequence analysis, including investigation of HCV genotype and mutations in the HCV envelope region.
  • Comparison of clinical characteristics, age, gender predominance, and response to immunosuppression between patient subgroups.
  • Investigation of potential molecular mimicry between viral proteins (HSV-1 IE-175) and the LKM-1 autoantigen (cytochrome P-450 II D6).
  • Association studies with specific human leukocyte antigen (HLA) alleles (HLA-DR3, C4-AQ0) in HCV-negative patients.

Main Results:

  • HCV RNA-positive autoimmune hepatitis type 2 patients were older, showed less pronounced female predominance, and had a poorer response to immunosuppression compared to HCV-negative patients.
  • Hepatitis C Virus (HCV) genotype II was prominent in HCV-positive autoimmune hepatitis type 2, with identified HCV mutants featuring deletions in the envelope region.
  • HCV-negative autoimmune hepatitis type 2 patients exhibited a significant association with HLA-DR3 and C4-AQ0 alleles.
  • Sequence homology was observed between the B-cell epitope of cytochrome P-450 II D6 and the IE-175 protein of HSV-1, suggesting a potential role for HSV-1 in HCV-negative cases.

Conclusions:

  • Autoimmune hepatitis type 2 exhibits distinct clinical and etiological profiles depending on the presence or absence of HCV infection.
  • HCV mutants and specific HLA alleles may play significant roles in the pathogenesis of autoimmune hepatitis type 2.
  • Further research is needed to elucidate the relevance of identified HCV mutants and the potential role of HSV-1 in inducing autoimmunity in specific patient subgroups.